British police report at least two people are dead after a commercial helicopter crashed into a roadway in south-central London, near a key rail station for incoming commuters.

Reports say the helicopter pilot was one of those killed.

Medical authorities say nine other people were injured. One of the injured was in critical condition.

Local news reports say the aircraft hit a crane atop a luxury apartment building under construction and then ricocheted into the street below, igniting a fireball that sent plumes of smoke into the sky. The crash left a trail of debris and flames burning down the street.

The crash happened near Vauxhall Station, one of the main junctions for rail traffic entering the city. It took place during the morning rush hour, virtually halting traffic. Service has been suspended at a nearby subway station.

Ambulances and police vehicles are on the scene, and authorities have promised an investigation.

The crash took place near the headquarters of Britain's MI6 intelligence agency, but police have said there is no evidence to suggest the crash was linked to terrorism.